The Professional Footballers' Association said "violence towards players is completely unacceptable" after a supporter attacked Arsenal goalkeeper Aaron Ramsdale on Sunday.
Ramsdale, 24, was unhurt in the incident at Tottenham Hotspur Stadium.
"These incidents are happening far too often. Players have a right to be safe in their place of work," said the PFA.
"When a player is attacked, we expect the laws and regulations that are in place to protect players to be properly enforced.
"As the players' union, we treat this as a priority issue. We will continue working with the authorities to demand players and staff are better protected in their place of work.